IO Biotech (IOBT) stock rallies as cancer vaccine, Cylembio, with Merck's (MRK) Keytruda outperforms in a late-stage trial ...

Shares of several biotech firms fell in premarket trading Monday after reports that ousted U.S. Food and Drug Administration vaccine regulator Vinay Prasad will return to the agency.

GSK (NYSE:GSK) announced on Monday that the U.S. FDA has granted priority review for its marketing application, aimed at ...